TY - JOUR
T1 - Oscillations Modulating Power Law Exponents in Isotropic Turbulence
T2 - Comparison of Experiments with Simulations
AU - Iyer, Kartik P.
AU - Bewley, Gregory P.
AU - Biferale, Luca
AU - Sreenivasan, Katepalli R.
AU - Yeung, P. K.
N1 - Funding Information:
The experiments were performed at the Max Planck Institute with M. Sinhuber and E. Bodenschatz, to whom we are grateful for the possibility to use the data. We thank D. Buaria for his contributions to the simulations. This work is partially supported by the National Science Foundation (NSF), via Grant No. ACI-1640771 at the Georgia Institute of Technology. This work used the Extreme Science and Engineering Discovery Environment (XSEDE), which is supported by National Science Foundation Grant No. ACI-1548562, on Stampede2 provided through Allocation TG-MCA99S022. The computations were performed using supercomputing resources through the Blue Waters Project at the National Center for Supercomputing Applications at the University of Illinois (Urbana-Champaign). This work received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (grant agreement No. 882340).
Publisher Copyright:
© 2021 American Physical Society.
PY - 2021/6/25
Y1 - 2021/6/25
N2 - Inertial-range features of turbulence are investigated using data from experimental measurements of grid turbulence and direct numerical simulations of isotropic turbulence simulated in a periodic box, both at the Taylor-scale Reynolds number Rλ∼1000. In particular, oscillations modulating the power-law scaling in the inertial range are examined for structure functions up to sixth-order moments. The oscillations in exponent ratios decrease with increasing sample size in simulations, although in experiments they survive at a low value of 4 parts in 1000 even after massive averaging. The two datasets are consistent in their intermittent character but differ in small but observable respects. Neither the scaling exponents themselves nor all the viscous effects are consistently reproduced by existing models of intermittency.
AB - Inertial-range features of turbulence are investigated using data from experimental measurements of grid turbulence and direct numerical simulations of isotropic turbulence simulated in a periodic box, both at the Taylor-scale Reynolds number Rλ∼1000. In particular, oscillations modulating the power-law scaling in the inertial range are examined for structure functions up to sixth-order moments. The oscillations in exponent ratios decrease with increasing sample size in simulations, although in experiments they survive at a low value of 4 parts in 1000 even after massive averaging. The two datasets are consistent in their intermittent character but differ in small but observable respects. Neither the scaling exponents themselves nor all the viscous effects are consistently reproduced by existing models of intermittency.
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U2 - 10.1103/PhysRevLett.126.254501
DO - 10.1103/PhysRevLett.126.254501
M3 - Article
C2 - 34241532
AN - SCOPUS:85108914390
SN - 0031-9007
VL - 126
JO - Physical Review Letters
JF - Physical Review Letters
IS - 25
M1 - 254501
ER -